Based　on　the　analysis　of　adsorptive　features　of　oyster　shells,　the　researches　on　the　treatment　of　phosphorous　wastewater　with　oyster　shells　and　the　effect　of　temperature　on　phosphorus　removal　were　carried　out.　XRD　was　used　to　characterize　the　crystalline　phases,　and　the　main　component　of　oyster　shells　was　shown　to　be　CaCO3.　When　the　pretreatment　temperature　reached　800　°C,　some　CaCO3　decomposed　into　CaO.　As　the　temperature　was　further　raised,　CaO　increased　gradually.　Via　SEM　testing,　the　oyster　shell　was　a　kind　of　natural　porous　materials.　The　pore　wall　partially　collapsed　from　550　to　900　°C.　No　obvious　porous　structure　was　found　at　900　°C.　However,　without　preheating,　the　oyster　shell　phosphorous　removal　material　can　not　adsorb　the　phosphorus.　Pretreatment　made　calcium　activate,　thus　greatly　increasing　the　absorption　of　phosphorus.